adolescents 1 [vynechat] attitude change 1 [vynechat] dospievajúca mládež 1 [vynechat] health behavior 1 [vynechat] mental hygiene 1 [vynechat] poruchy spánku 1 [vynechat] psychohygiena 1 [vynechat] sleep 1 [vynechat] sleep disorders 1 [vynechat] spánok 1 [vynechat] zmena postoja 1 [vynechat] životospráva 1 [vynechat]